package io.github.jsp.service.monitoring;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

@Service
public class AlertService {
    
    private static final Logger logger = LoggerFactory.getLogger(AlertService.class);
    
    private final ExecutorService alertExecutor = Executors.newCachedThreadPool(r -> {
        Thread t = new Thread(r, "AlertService");
        t.setDaemon(true);
        return t;
    });
    
    public void sendAlert(String title, String content, String emails) {
        CompletableFuture.runAsync(() -> {
            sendAlertAsync(title, content, emails);
        }, alertExecutor);
    }
    
    private void sendAlertAsync(String title, String content, String emails) {
        try {
            logger.warn("=== 服务监控告警 ===");
            logger.warn("标题: {}", title);
            logger.warn("内容:\n{}", content);
            
            if (emails != null && !emails.trim().isEmpty()) {
                logger.warn("通知邮箱: {}", emails);
                // 这里可以集成邮件发送功能
                sendEmailAlert(title, content, emails);
            }
            
            // 可以集成其他通知方式
            sendWebhookAlert(title, content);
            sendSmsAlert(title, content);
            
        } catch (Exception e) {
            logger.error("发送告警通知时发生异常", e);
        }
    }
    
    private void sendEmailAlert(String title, String content, String emails) {
        try {
            // 简化的邮件发送实现
            // 在实际项目中，可以使用SpringMail或其他邮件服务
            logger.info("发送邮件告警: {} -> {}", title, emails);
            
            // 示例：使用JavaMail发送邮件
            /*
            String[] emailArray = emails.split(",");
            for (String email : emailArray) {
                mailService.sendMail(email.trim(), title, content);
            }
            */
            
            // 模拟邮件发送
            Thread.sleep(100);
            logger.debug("邮件告警发送完成");
            
        } catch (Exception e) {
            logger.error("发送邮件告警失败", e);
        }
    }
    
    private void sendWebhookAlert(String title, String content) {
        try {
            // 示例：发送到企业微信、钉钉或Slack等
            logger.debug("发送Webhook告警: {}", title);
            
            // 可以使用HttpUtil发送HTTP请求到Webhook地址
            /*
            String webhookUrl = "https://your-webhook-url";
            String payload = buildWebhookPayload(title, content);
            httpUtil.post(webhookUrl, payload, 5000);
            */
            
        } catch (Exception e) {
            logger.error("发送Webhook告警失败", e);
        }
    }
    
    private void sendSmsAlert(String title, String content) {
        try {
            // 示例：发送短信告警
            logger.debug("发送短信告警: {}", title);
            
            // 可以集成阿里云短信、腾讯云短信等服务
            /*
            String phoneNumbers = getAlertPhoneNumbers();
            smsService.sendSms(phoneNumbers, title + ": " + content);
            */
            
        } catch (Exception e) {
            logger.error("发送短信告警失败", e);
        }
    }
    
    public void sendRecoveryAlert(String serviceName, String serviceAddress) {
        String title = String.format("服务恢复通知 - %s", serviceName);
        String content = String.format(
            "服务: %s\n" +
            "地址: %s\n" +
            "状态: 已恢复正常\n" +
            "时间: %s",
            serviceName,
            serviceAddress,
            new java.util.Date()
        );
        
        logger.info("=== 服务恢复通知 ===");
        logger.info("标题: {}", title);
        logger.info("内容:\n{}", content);
        
        // 发送恢复通知
        CompletableFuture.runAsync(() -> {
            sendAlertAsync(title, content, null);
        }, alertExecutor);
    }
    
    public void sendBatchAlert(String title, String content, int affectedServiceCount) {
        if (affectedServiceCount > 1) {
            title = String.format("批量服务告警 - %d个服务异常", affectedServiceCount);
        }
        
        sendAlert(title, content, null);
    }
    
    private String buildWebhookPayload(String title, String content) {
        // 构建Webhook请求体，格式根据具体平台而定
        return String.format(
            "{\"msgtype\":\"text\",\"text\":{\"content\":\"%s\\n\\n%s\"}}", 
            title, content.replace("\n", "\\n"));
    }
}